Process of producing polychromatic screens.



A. & L. LUMIERE.

PROCESS OP-PRODUGING POLYGHBOMATIO SCREENS. APPLICATION FILED 001'. 16,1908.

91 6,467. Patented Mar. 30, 1909.

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"IIIIIIIIIflII/IIIIIIII AUGUSTE LUMIERE AND LOUIS LUMIERE, OF LYONS-MONTPLAISIR, FRANCE.

- PROCESS OF rnonucme POLYCHROMATIC scanners.

Specification of Letters Patente Patented March 30, 1909.

Application filed October 15, 1908. Serial No. 457,885.

To all whom it may concern:v

Be it knownthat'we, AUeUsTE LiIMIiERE and LOUIS LUMIERE, both residing at Lyons- Mont plaisir, France, have invented a certain new and useful Improvement in Processes of Producing Polyehroniatic Screens, of which the following is a specification.

This invention consists in a process of preparing a polychromatic screen by means of successive coloring and decoloring operations, with complete absence of superposition of colors and of blank spaces, and without the necessity of re-touching or finishing the screen after the said operations.

The invention will be described with reference to the annexed drawing, in which Figures 1, 2, 3 and 4 represent, on aeonsiderably enlarged scale, a fragment of a trichromatic screen at successive stages of its manufacture.

The process of manufacture is as follows.

(1). A glass plate or other trans arent support, for example, a film or the ike, is coated with a thin layer of gelatin or other suitable substance, which has, or is given,-

one of the threecolors which the screen is to comprise, for example one of the colors orange, violet and green.

(2). When the plate has been uniformly colored, for example violet, parallel strips a a (Fig. 2) of fatty ink are impressed thereon by a suitable known process, to cover. appfoximatelya third of the surface of the ate.

(3). The colored substance which has remained uncovered by the ink is then destroyed or removed by means of a chemical agent, and the parts exppsed or decolorized in this manner are then given one of the other two colors, for example orange. The operations so far performed have produced a plate with strips of violet color coated with ink, aggregating approximately one third of the surface area, the remaining two thirds being strips of orange color.

(4). Another series of strips of ink b (Fig. 3) is thenimpressed on the plate, preferably cutting the strips a at right angles, the spaces between the lines I) being of approximately the same width as the lines themselves.

(5). The spaces or fields bordered by the strips 0 and b are then chemically treated to remove the orange color, and are then colored green, so that the plate has on its surface continuous strips of violet covered with ink, parallelograms of orange covered with ink, and uncovered parallelograms of green.

(6). The lines or strips of ink are then removed by washing the late with a solvent such as benzin, which oes not act on the colors and by this means'a screen is obtained as -shown in' Fig. 4, in which the differently hatched parts represent the different colors. The screen is then varnished in the knoun manner and coated with a sensitive layer.

The impressions of ink need not be rectilinear. They may be curved, angular or may consist of dots or figures of any desired shape, provided that they are suitably dis tributed and that the surface area which they cover is in the proper relation to the remaining area. Each color, in the case illustrated, occupies approximately one third of the total surface, but this proportion may be varied, according to the nature of the colors.

This description of the production of a trichromatic plate will serve to make clear how plates comprising any number of colors may 0 produced by the process set forth.

What we claim as our invention and desire to secure by Letters Patent of the United States is The process of preparing a polychromatic screen for photographing in colors, consisting in coloring the entire screen With one of the colors, coating with fatty ink those parts which are to retain this color, removing the color from the parts not coated, coloring the exposed surface \iith the second color to be used, coating with fatty ink those parts of said second color which are to be retained,

removing the color from the parts still uncoated, and re eating the same operation for each of the colors to be applied, and finally washing away the ink coatings.

In witness whereof we have signed this specification in the presence of two witnesses.

AUGUSTE LUMIERE, LOUIS LUMIERE.

Witnesses:

Trros. N. BROWNE, GASTON JEANNIAUX. 

